Population change map • testmap

Map

Due to the number of points, the map can become slow to respond when you zoom in. Zoom out to a level showing fewer points and you can pan around the map to find the area of interest. Then zoom in again to check the coloured points.

Free-flowing rivers

When you zoom in you will see shaded points. Points are brown where populations are expected to decline by 50% or more within 3 generations (42 years). Brown points therefore represent rivers where the species is Endangered, following the IUCN Redlist criteria - A3bd.

River points Norris et. al. 2019

Map below uses the river points from Norris et. al. 2019.

When you zoom in you will see shaded points. Points are brown where populations are expected to decline by 50% or more within 3 generations (42 years). Brown points therefore represent rivers where the species is Endangered, following the IUCN Redlist criteria - A3bd.

Tables

A summary of the results is presented below. Summaries by country and major basin.

Summary by country.

Country	Accessible	Endangered (prop)	river length (km)	length End.	length not End.	Free Flowing (prop)	length ff	length not ff
Bolivia	no	0	1641	0	1641	1.00	1641	0
Bolivia	yes	1	17098	17098	0	0.98	16735	363
Brazil	no	0	30758	0	30758	0.98	30253	505
Brazil	yes	1	92740	92740	0	0.93	86027	6713
Colombia	no	0	6771	0	6771	1.00	6771	0
Colombia	yes	1	11266	11266	0	0.98	11045	221
Ecuador	no	0	154	0	154	1.00	154	0
Ecuador	yes	1	3176	3176	0	1.00	3169	7
French Guiana	no	0	443	0	443	1.00	443	0
French Guiana	yes	1	1390	1390	0	0.89	1239	151
Guyana	no	0	1403	0	1403	1.00	1403	0
Guyana	yes	1	3272	3272	0	1.00	3272	0
Peru	no	0	2143	0	2143	1.00	2143	0
Peru	yes	1	21304	21304	0	1.00	21266	38
Suriname	no	0	1805	0	1805	1.00	1805	0
Suriname	yes	1	2103	2103	0	0.89	1869	234
Venezuela	no	0	5759	0	5759	0.97	5604	155
Venezuela	yes	1	12623	12623	0	0.78	9889	2734
Total			215849	164972	50877		204728	11121

Summary by basin.

Using results from updated Norris et. al. 2019.

Basin	Endangered (prop)	river length (km)	length End.	length not End.
Amazon	0.77	170905	131958	38947
Coastal North	0.68	12700	8626	4074
Coastal South	1.00	5711	5711	0
Orinoco	0.70	26533	18677	7856

Same using Free-flowing rivers data.

Basin	Endangered (prop)	river length (km)	length End.	length not End.
Amazon	0.72	280121	202508	77613
Coastal North	0.52	20835	10879	9956
Coastal South	1.00	6467	6467	0
Orinoco	0.64	46014	29533	16481

Summary by major basins and countries.

Basin	Country	Endangered (prop)	river length (km)	length End.	length not End.
Amazon	Bolivia	0.91	18739	17098	1641
Amazon	Brazil	0.74	116106	85750	30356
Amazon	Colombia	0.54	7769	4229	3540
Amazon	Ecuador	0.95	3330	3176	154
Amazon	Guyana	1.00	299	299	0
Amazon	Peru	0.91	23447	21304	2143
Amazon	Venezuela	0.08	1215	102	1113
Coastal North	Brazil	0.76	1681	1279	402
Coastal North	French Guiana	0.76	1833	1390	443
Coastal North	Guyana	0.68	4376	2973	1403
Coastal North	Suriname	0.54	3908	2103	1805
Coastal North	Venezuela	0.98	902	881	21
Coastal South	Brazil	1.00	5711	5711	0
Orinoco	Colombia	0.69	10268	7037	3231
Orinoco	Venezuela	0.72	16265	11640	4625

Same with Free-flowing rivers…..

Basin	Country	Endangered (prop)	river length (km)	length End.	length not End.
Amazon	Bolivia	0.70	22217	15516	6701
Amazon	Brazil	0.73	180434	132296	48138
Amazon	Colombia	0.53	18687	9874	8813
Amazon	Ecuador	0.85	8302	7066	1236
Amazon	Guyana	1.00	423	423	0
Amazon	Peru	0.78	47363	36750	10613
Amazon	Venezuela	0.22	2695	583	2112
Coastal North	Brazil	0.66	3653	2421	1232
Coastal North	French Guiana	0.63	3297	2081	1216
Coastal North	Guyana	0.41	6928	2867	4061
Coastal North	Suriname	0.46	5756	2643	3113
Coastal North	Venezuela	0.72	1201	867	334
Coastal South	Brazil	1.00	6466	6466	0
Coastal South	French Guiana	1.00	1	1	0
Orinoco	Brazil	0.00	2	0	2
Orinoco	Colombia	0.72	19865	14248	5617
Orinoco	Guyana	1.00	21	21	0
Orinoco	Venezuela	0.58	26126	15264	10862

Next steps

Update using points from Free Flowing Rivers
https://www.worldwildlife.org/pages/free-flowing-rivers